Hoshino Onsen 星野温泉 トンボの湯

Karuizawa's premier spot for rejuvenating body and mind

Hoshino Onsen is part of the Hoshinoya Karuizawa Resort, a sophisticated luxury hot spring facility. Set in the tranquil woodlands north of the shopping and dining area of Naka-Karuizawa, come here to recharge after a long shopping and sightseeing excursion.

How to Get There

Hoshino Onsen is accessible from Tokyo via train then shuttle bus.

The Hokuriku Shinkansen serves JR Karuizawa Station. It is also the terminus on the private Shinano Railway Line, which runs from Nagano Station. Free shuttle buses connect Karuizawa Station to the resort in about 20 minutes.

For those who want to explore Naka-Karuizawa and its chic shops and cafes en route to the onsen, it's a 25-minute walk from the station. Rental bikes are also available just outside the station.

Quick Facts

Hoshinoya Karuizawa is home to a wild bird sanctuary and was a favored resort of the founder of the Wild Bird Society of Japan

The resort generates around 70% of its power through hydroelectric and geothermal energy

The Tombo no Yu day spa is open to the public

Soak in style

Hoshino Onsen is located at the foot of Mt. Asama along the Yukawa River. The inn that evolved into the Hoshinoya Karuizawa Resort of today dates back to 1904, and the natural hot spring there is known for its low-alkaline water, known for its benefits to the skin. The relaxed forest setting helped make it popular with the literati who came to escape Tokyo summers. Japanese authors including Hakushu Kitahara and Toson Shimazaki completed books at the inn.

The excellent facilities of Tombo no Yu

Hoshinoya Karuizawa caters to guests seeking to get in touch with nature in the quiet mountain resort. The Tombo no Yu onsen facility welcomes you with modern facilities and the scent of Japanese cypress. The indoor bath area features high ceilings, stone tubs, and wide windows that look out on the wooded surroundings. The elegant stone outdoor bathing areas have a view of Mt. Asama .

After a soak, you can stroll down to the chic restaurant enclave of Harunire Terrace, where you can choose from restaurants offering Nagano's famous soba noodles, stone-baked pizza, French cuisine, and more.

Near Hoshino Onsen

Hoshino Onsen Kitasaka-gun, Nagano-ken
Karuizawa Ginza Shopping
Kyu-Karuizawa Kitasaku-gun, Nagano-ken
Shiraito Waterfall Nature
Shiraito Falls (Nagano) Kitasaka-gun, Nagano-ken
Karuizawa Prince Shopping Plaza Kitasaka-gun, Nagano-ken
karuizawaprincehoteleast Luxury Stay
Karuizawa Prince Hotel East
kusatsu area Nature
Mt. Asama (Nagano) Karuizawa, Nagano-ken

Please Confirm Your Location

We use location data to provide you with accurate tourism info